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ADJUSTMENTS
D Before making adjustments, please read the "before disassembling and repairing"
"precaution for handling pickup" "description of leser beam control circuit"and
» "disassembly"
* Service Mode
This mode is used for adjustment when servicing and its
functions are incorporated in the microcomputer (1C501).
Please read following explanation carefully to understand
the function of this mode,
(1) The
program
of |C 501 operates when
the power
switch is "ON" and reset signal is input to pin 18 of
IC 501,
(2) First, select either a service program routine or a
normal routine.
(3) If you select a service program routine, the micro-
processor brings the necessary work from each sub-
routine
in accordance
with
the key inputs,
then
executes the work,
With
this service mode, you can efficiently check
or
Test disc necessary for adjustment
)
Measuring equipment necessary for adjustment
Equipment
Model No. (manufacturer)
Synchroscope
$S5711 (100 MHz — Doble reflective
BAND-PASS
FILTER
Memory scope
DSS 6521 (storage scope) kikusui Denshi
AC digital voltmeter | Digital tester or digital multimeter is available
IN
OUT
DC digital voltmeter | Digital tester or digital multimeter is available
Audio signal generator
Notes;
a
Other manufactures' equipment which has same specificat-
ions with ones designated above may be used.
b Use a probe when observing signal using an oscilloscope,
memory scope or digital voltmeter.
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